The Harmony Sit-on-Top Cart has a ratcheting frame to adjust and fit any type of SOT kayak, including the Wilderness Systems Tarpon and the Wilderness Systems Ride models. Scupper holes slide through adjustable frame posts, then the frame is secured with a strap for stability. Its blue anodized coating is sleek and corrosion resistant. The all-terrain tires are durable, pneumatic tires that travel well on paved or compacted surfaces. They are partially filled with foam so they will continue to roll in the event of a puncture.